I think one thing that is crucial is picking short day onions down here. I have tried lots of intermediate day and a few long day onions and none of them produce well and some didn't make any onions at all. The most dependable onion for me has been white Bermuda onions that I start from seed in October and set out in late December or January. They also will store well as long as they are kept in a fairly dry location. I just put mine in mesh bags that oranges come in and hang them. It is a good idea to check them from time to time by smelling them closely and if you smell something off check the bag and make sure one isn't rotting on you because it will spread fast.
Vidalia types do great down here but they don't store well at all. I have a friend who peels his Vidalias and puts them in zip lock bags in a refrigerator and says they keep well that way. I haven't tried it in large amounts but have stored small bags of peeled onions for several weeks at the time so it may work.
I ordered several varieties of short day onions to try besides the Bermudas this year. Living down here in the deep south growing long day onions isn't a choice but they are usually the varieties that will keep the best as storage onions.
Bill
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